package com.shanpayapi.cn.util;

import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;

public final class Utf8 {
	private static final Charset CHARSET = Charset.forName("UTF-8");

	/**
	 * Get the bytes of the String in UTF-8 encoded form.
	 */
	public static byte[] encode(CharSequence string) {
		try {
			ByteBuffer bytes = CHARSET.newEncoder().encode(
					CharBuffer.wrap(string));
			byte[] bytesCopy = new byte[bytes.limit()];
			System.arraycopy(bytes.array(), 0, bytesCopy, 0, bytes.limit());

			return bytesCopy;
		} catch (CharacterCodingException e) {
			throw new IllegalArgumentException("Encoding failed", e);
		}
	}

	/**
	 * Decode the bytes in UTF-8 form into a String.
	 */
	public static String decode(byte[] bytes) {
		try {
			return CHARSET.newDecoder().decode(ByteBuffer.wrap(bytes))
					.toString();
		} catch (CharacterCodingException e) {
			throw new IllegalArgumentException("Decoding failed", e);
		}
	}
}
